"The show must go," said Fallon. "It's just happened yesterday and it's never happened before to us, so I was thinking, 'who do we get to come on the show'. And then I realized that we already have the best band in the world - The Roots - are here every single night. And Bono's wardrobe is here because he was going to wear it tonight but obviously he's not going to need it now. So I thought 'let's have some fun with it."

Fallon donned Bono's gear and teamed up with The Roots for a performance of U2's 1988 hit, "Desire." U2 revealed news of Bono's accident to fans on Sunday.

"It looks like we will have to do our Tonight Show residency another time - we're one man down," posted the group. "Bono has injured his arm in a cycling spill in Central Park and requires some surgery to repair it. We're sure he'll make a full recovery soon, so we'll be back! Much thanks to Jimmy Fallon and everyone at the show for their understanding."